[R] ylab/ expression/ superscript to a bracket

[S.McClatchie]

Colleagues

  ----------------------------------
  System info:
  R version rw1022 on NT
  ESS v. 5.1.18 using emacs ver. 20.4

  ----------------------------------
  I have some rather unusual units for acoustic volume backscattering
  integrated over several metres depth and 10 transmits (which happens to
  = 160 m along transect). I need to express these units in a graph label.

  My problem comes in applying a superscripted number to a bracket (see
  the )^{-3} below:

  ylab=expression(paste('mean SV dB [', m^{2},' (160 m',)^{-3},']'))

  This gives an error (due to what is interpreted as an extra bracket).
  However, superscript requires a character to superscript to, so I can
  either use a dot (which is confusing in the label) 

   ylab=expression(paste('mean SV dB [', m^{2},' (160 m)',.^{-3},']'))

  or use another kind of bracket. Unfortunately the label needs two kinds
  of brackets. Also using a brace, }^{-3} doesn't help for obvious
  reasons.

  Any hints? Help will be appreciated.

  Thanks

  Sam

Sam McClatchie, Research scientist (fisheries acoustics))))))))))
NIWA (National Institute of Water & Atmospheric Research Ltd)
PO Box 14 901, Kilbirnie, Wellington, New Zealand
s.mcclatchie at niwa.cri.nz 

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